Renting a motorbike and driving around northern Thailand, or Lao, or, Vietnam, anywhere in hilly/mountainous areas is an experience of great beauty. It's a bit hard, physically, and of course it's somewhat dangerous. But if you are careful, you'll be as safe as can be and I found it really rewarding.
I have heard good things about Songkran festival, the Thai/Lao new year, especially in northern Thailand (Chiang Mai, Lampang). Must see by all accounts.
I personnally had a good time in smaller localities in Lao during the Tet (chinese/viet new year) as many people were just partying it up and invited me to their celebrations, so try to be around areas with vietnamese during their new year^^
If you're into sports, why not join the Angkor marathon in december?

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